The immune system is composed of many interdependent cell types that collectively protect the body from bacterial, parasitic, fungal, viral infections and from the growth of tumor cells. Many of these cell types have specialized functions. The cells of the immune system can engulf bacteria, kill parasites or tumor cells, or kill viral-infected cells. Often, these cells depend on the T helper subset for activation signals in the form of secretions formally known as cytokines,
lymphokines, or more specifically interleukins.
The immune system is a complex and highly developed
system, yet its mission is simple: to seek and kill invaders. If a person is
born with a severely defective immune system, death from infection by a virus,
bacterium, fungus or parasite will occur.
In severe combined immunodeficiency,
lack of an enzyme means that toxic waste builds up inside immune system cells,
killing them and thus devastating the immune system. A lack of immune system
cells is also the basis for DiGeorge syndrome: improper development of the
thymus gland means that T cell production is diminished.
Immune System and
There is strong evidence to suggest that the immune system
plays a role in preventing cancerous tumors. However research also suggests that
the tumors may evade the immune systemís defenses.
immune system protects the body against infections by bacteria, viruses and
other parasites. It is really a collection of responses that the body makes to
infection. So it is sometimes called the 'immune response'.
immune system is important to cancer patients in many ways:
1- The cancer can weaken the immune system
2- Cancer treatment can weaken the immune system
3- The immune system may help to fight your cancer
4- The cancer can weaken the immune system by invading the bone marrow where
the cells that help fight infection are made. This happens most often in
leukaemia or lymphoma.
it can happen with other cancers too:
and radiotherapy can weaken immunity by causing a drop in the number of white
blood cells made in the bone marrow. Apart from bone
marrow or stem cell transplants, this
effect on the bone marrow is temporary.
cells of the immune system can recognize cancer cells as abnormal and kill them.
Unfortunately, this is not enough to get rid of a cancer altogether.
Ginseng, Fo-Ti (Ho shou wu), Astragalus (Astragalus membranaceus),
(Bupleurum falcatum), Radix
Rehmannia, Lycium barbarum, Salvia miltiorrhiza, Radix
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